They make one but don’t seem to be in stock at the moment.
Google LG-305G Green Lasergrips® to see if you can find one.
http://www.adorama.com/CRILG305G.html?gclid=CPWE5PCX7boCFVRnOgodZmkA6g
How do you know if it’s a round butt? My S&W 360 PD looks like a square btt.
http://www.smith-wesson.com/wcsstore/SmWesson2/upload/images/firearms/detail_md/163064_01_md.jpg